<template>
  <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

        <!-- 卡片视图区域 -->
      <el-card>
          <!-- 提示区域 -->
          <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon
            :closable="false">
        </el-alert>

        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" align-center finish-status="success">
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'"
            :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane name="0" label="基本信息">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input type="number" v-model="addForm.goods_price"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input type="number" v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                        v-model="addForm.goods_cat"
                        :options="catelist"
                        expand-trigger='hover'
                        @change="handleChange"
                        :props="cateProps"
                        clearable></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane name="1" label="商品参数">
                    <!-- 渲染表单的item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane name="2" label="商品属性">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane name="3" label="商品图片">
                    <!-- 上传图片问题 -->
                    <!-- action表示图片要上传到的后台api地址 -->
                    <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture"
                    :headers="headerObj"
                    :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane name="4" label="商品内容">
                    <!-- 富文本编辑器组件 -->
                    <quill-editor v-model="addForm.goods_introduce">
                    </quill-editor>
                    <el-button type="primary" @click="add" class="btnAdd">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>
      </el-card>


<!-- 图片预览 -->
      <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
    name: 'add',
    data(){
        return{
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片数组
                pics:[],
                // 商品的详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name: [
                    {required: true,message: '请输入商品名称', trigger: 'blur'},
                ],
                goods_price: [
                    {required: true,message: '请输入商品价格', trigger: 'blur'},
                ],
                goods_weight: [
                    {required: true,message: '请输入商品重量', trigger: 'blur'},
                ],
                goods_number: [
                    {required: true,message: '请输入商品数量', trigger: 'blur'},
                ],
                goods_cat:[
                    {required: true,message: '请选择商品分类', trigger: 'blur'},
                ],

            },
            // 商品分类列表
            catelist: [],
            cateProps:{
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的url地址
            uploadURL:'http://47.106.138.99:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj:{
                Authorization:
                window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false,
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200) return this.$message.error('获取商品分类数据失败！')
            this.catelist = res.data
        },
        // 级联选择器选中项变化，会触发此函数
        handleChange(){
            // console.log(this.addForm.goods_cat);
            if (this.addForm.goods_cat.length !== 3) this.addForm.goods_cat = []
        },
        beforeTabLeave(activeName, oldActiveName){
            // console.log('即将离开', oldActiveName);
            // console.log('即将进入', activeName);
            // return false;
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请选择商品分类')
                return false
            }
        },
        // 切换tab
        async tabClicked(){
            // 证明访问的是动态参数面板
            if(this.activeIndex === '1'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                res.data.forEach(item=>{
                   item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex === '2'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel: 'only'}})
                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性列表失败！')
                }
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // 1 获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2 从 pics 数组中， 找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x=> x.pic === filePath)
            // 3 调用数组的 splice 方法， 把图片信息对象，从 pics 数组中移除
            this.addForm.pics.splice(i, 1)
            // console.log(this.addForm.pics);
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // console.log(response);
            // 拼接得到一个图片信息对象，
            const picInfo = {pic: response.data.tmp_path}
            // 将图片信息对象push到数组章
            this.addForm.pics.push(picInfo)
            // console.log(this.addForm.pics);
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return this.$message.error('请填写必要的表单项！')
                // 请执行添加业务逻辑
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数和静态属性
                this.manyTableData.forEach(item=>{
                    const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item=>{
                    const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                // 发起请求添加商品
                // 商品的名称是唯一的
                const {data: res} = await this.$http.post('goods', form)
                if(res.meta.status !== 201) return this.$message.error('添加商品失败！')
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style scoped>
.el-checkbox{
    margin-right:5px !important;
}
.previewImg{
    width: 100%
}
.btnAdd{
    margin-top: 15px;
}
</style>